Changsha Zoomlian Pump Co., Ltd. 长沙中联泵业股份有限公司

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    Multistage centrifugal boiler feed pump of medium-high pressure type DG
    Multistage centrifugal boiler feed pump of medium-high pressure type DG
    Multistage centrifugal boiler feed pump of medium-high pressure type DG
    Multistage centrifugal boiler feed pump of medium-high pressure type DG
    Multistage centrifugal boiler feed pump of medium-high pressure type DG
    Multistage centrifugal boiler feed pump of medium-high pressure type DG
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    • Multistage centrifugal boiler feed pump of medium-high pressure type DG
    • Multistage centrifugal boiler feed pump of medium-high pressure type DG
    • Multistage centrifugal boiler feed pump of medium-high pressure type DG
    • Multistage centrifugal boiler feed pump of medium-high pressure type DG
    • Multistage centrifugal boiler feed pump of medium-high pressure type DG
    • Multistage centrifugal boiler feed pump of medium-high pressure type DG

    Category:

    Boiler Feedwater Pump

    Keywords:

    Pump

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    Multistage centrifugal boiler feed pump of medium-high pressure type DG

    Flow: 35-180m³/h

    Lift height: 409-1056m

    Efficiency: 43%-83%

    Pump weight: 77-1964kg

    Motor power: 4.5-4500kw

    NPSH (Cavitation margin): 2.0-7.0m

    Price: 0.82-16.9 thousand

     

    Suitable for transporting clean water with medium temperature between -20℃ and 160℃ (medium pressure not exceeding 105℃), or non-corrosive liquids with physical-chemical properties similar to water. The pump inlet pressure should not exceed 0.59M (6kgf/cm2). Widely used in power plants, metallurgy, heating, and other sectors for boiler water supply, also suitable for unit systems and main pipeline systems in units of various capacities in power plants.

    +86 0731-88192288

    Customer service hotline

    info@cipump.com

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    Product Description Product Specifications Why Choose Us? FAQ

    Product description

    The DG type sub-high pressure boiler feed pump complies with the JB/T1051-93 standard "Basic types and parameters of multistage centrifugal pumps for clean water," featuring high efficiency, wide performance range, safe and stable operation, low noise, long service life, and easy installation and maintenance. It is suitable for transporting clean water with a medium temperature from -20℃ to 160℃ (customizable for higher temperatures), or non-corrosive liquids with physical and chemical properties similar to clean water. It can also transport hot water, oils, corrosive or abrasive media by changing the materials of the flow parts, sealing type, and adding a cooling system. The DG pump's inlet pressure should not exceed 0.59M (6kgf/cm2), with a maximum head of up to 1056 meters (DG multistage pumps can reach up to 2150 meters). It has multiple uses and is commonly used as a boiler circulation pump in power plants, metallurgy, heating, etc. It can also function as a boiler feed pump or boiler water circulation pump and is suitable for water supply systems in units and main pipelines of power plants of various capacities. The DG pump is an efficient and energy-saving product designed for new or renovated industrial steam boilers, suitable not only for medium and low-pressure boilers but also for high-lift water transportation in factories and cities. 
     
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            Image 1   Structural features of the DG type sub-high pressure multistage feed pump  

    1. The DG type high-pressure boiler pump is a single-suction multistage centrifugal pump with a segmented section and an axially detachable casing. The DG85-80×8 pump model has a suction inlet oriented vertically upward and an outlet also vertically upward, perpendicular to the shaft. From the drive side, the pump rotation is clockwise, although it can also be manufactured counterclockwise according to user needs, which must be specified when ordering.

    Structural diagram of the DG boiler feed pump

    　　2. The pump body and cover form the impeller working chamber. There are threaded holes on the inlet and outlet flanges for installing vacuum and pressure gauges, and a threaded hole at the bottom of the body for draining residual water. The impeller is single-suction and closed, with a balance disk that compensates for most of the axial force, as well as a thrust bearing to support the small residual axial force. The bearings keep the shaft in a stable tension state. Before assembly, the impeller must pass a strict static balance check to ensure stable operation. The pump shaft is supported by two Babbitt alloy sliding bearings, lubricated with light oil and housed in the shaft support.

    　　3. Inside the pump body, there is a sealing ring that improves volumetric efficiency and prevents high-pressure water backflow into the suction chamber, which would disturb the inlet flow and ensures suction performance. The shaft seal is generally a soft packing; during operation, a small amount of medium can be directed to the packing box, or external cooling and lubrication water can be connected for sealing and cooling. According to user needs, the packing can be replaced by a mechanical seal.

    　　4. Bearing balance: The rotor of the DG type high-pressure boiler pump is supported by ball bearings at both ends of the shaft, lubricated with light oil and cooled with circulating water. The axial force of the rotor is automatically balanced with a balance disk. The balance water returns to the suction section through a duct. The rotor of the DG type sub-high pressure pump is supported by sliding bearings at both ends of the shaft, lubricated with light oil and cooled with circulating water. The axial force is balanced with a balance disk; between the balance chamber and the front section, there is a return duct. The bearings have forced lubrication and the pump has an oil system. The axial force of the rotor is balanced with a balance disk and has a thrust bearing to support the residual axial force caused by changes in operating conditions. Between the balance chamber and the suction pipe, there is a return duct.

    　　5. Transmission: Medium and sub-high pressure multistage pumps are driven by a motor through an elastic coupling. From the transmission direction, the pump rotates clockwise. High-pressure pumps are also driven by a motor via elastic coupling and can be equipped, according to user needs, with toothed couplings, diaphragm couplings, or hydraulic couplings. The motor can be a small steam turbine or an electric motor. From the transmission direction, the pump rotates clockwise.

    On-site use of the boiler feed pump
    Production process

     

    Our company is a nationally recognized manufacturer of multistage centrifugal pumps, independently established after the restructuring of the former Zhonglian Pump Industry. We specialize in the development and manufacture of self-balancing multistage pumps, multistage boiler feed pumps, multistage mining pumps, and corrosion-resistant multistage pumps. We have more than 30 years of experience in research and manufacturing of multistage pumps. Thanks to our strong technical capability, extensive production experience, comprehensive inspection methods, as well as a professional design and engineering team and technical production staff, we have become a key national high-tech enterprise in multistage pump equipment. All our multistage water pumps are computer-designed and optimized, with stable and reliable quality and good anti-cavitation performance. We invite you to visit our factory and negotiate collaborations.

    Product Parameters

    Description of the Medium Pressure Multistage Boiler Feed Pump Model DG

    Flow range: Q=100~580m3/h (DG high pressure)
    Q=35~180m3/h (medium pressure, medium high pressure)
    Head range: H=740～2150m (high pressure)
    H=409~1056m (medium high pressure)
    H=270～672m (medium pressure)
    Transport temperature: -20-205℃ (indicate if above 150℃)
    Suction pressure: 0-7.5MPa (indicate if above 0.5 MPa)
    Sealing type: packing seal, mechanical seal

     

     

    Parameters of the Medium Pressure Multistage Boiler Feed Pump Model DG (these data are for reference only, please take the actual order as the standard!)

     

    D/DG/DF/MD6-25

    D/DG/DF/MD6-50

    D/DG/DF/MD6-80

    D/DG/DF/MD12-25

    D/DG/DF/MD12-50

    D/DG/DF/MD12-80

    D/DG/DF/MD25-30

    D/DG/DF/MD25-50

    D/DG/DF/MD25-80

    D/DG/DF/MD46-30

    D/DG/DF/MD46-50

    D/DG/DF/MD46-80

    D/DG/DF/MD85-45

    D/DG/DF/MD85-67

    D/DG/DF/MD85-80

    D/DG/DF/MD85-100

    D/DG/DF/MD120-50

    D/DG/DF/MD120-100

    D/DG/DF/MD150-30

    D/DG/DF/MD150-50

    D/DG/DF/MD150-80

    D/DG/DF/MD150-100

    D/DG/DF/MD155-30

    D/DG/DF/MD155-67

    D/DG/DF/MD200-50

    D/DG/DF/MD200-100

    D/DG/DF/MD200-150

    D/DG/DF/MD210-70

    D/DG/DF/MD280-43

    D/DG/DF/MD280-65

    D/DG/DF/MD280-95

    D/DG/DF/MD280-100

    D/DG/DF/MD300-45

    D/DG/DF/MD360-40

    D/DG/DF/MD360-60

    D/DG/DF/MD360-95

    D/DG/DF/MD450-60

    D/DG/DF/MD450-95

    D/DG/DF/MD500-57

    D/DG/DF/MD550-50

    D/DG/DF/MD580-60

    D/DG/DF/MD640-80

    D/DG/DF/MD720-60

    D/DG/DF/MD1100-85

    For more performance parameters of the Medium Pressure Multistage Boiler Feed Pump DG, download the intelligent selection software on the pump selection page or call: 0731-88192288 for more information.

    Changsha Zhonglian Pump Industry Co., Ltd.

    Why Choose Us?

    Changsha Zhonglian Pump Industry Co., Ltd. was established in 1989, following the reform of the Changsha Water Pump Factory. It is a national high-tech comprehensive enterprise integrating design, research and development, manufacturing, and service. The company was listed on the Hunan Provincial Stock Exchange on December 31, 2019, with the abbreviated name "Zhonglian Pump Industry" and stock code: 600275HN. It is currently a key enterprise in China's centrifugal pump industry and one of the leading domestic manufacturers of multi-stage pumps, headquartered in Changsha, Hunan, a historical and cultural city in China.

    Changsha Zhonglian Pump Industry Co., Ltd.
    Changsha Zhonglian Pump Industry Co., Ltd.

    FAQ

    Q

    What products do you mainly produce?

    A

    Zoomlion Pump Industry manufactures various large industrial centrifugal pumps. The main products include: self-balancing multistage pumps, multistage centrifugal pumps, single-stage centrifugal pumps, split-case pumps, chemical pumps, submersible pumps, pipeline pumps, long-shaft pumps, condenser pumps, and more.

    Q

    Can you help me choose a model?

    A

    Of course! If the water pump model is not selected accurately, it can cause significant problems. After you take it back, it might be either too small to meet the usage requirements or too large, resulting in higher electricity and fuel costs, increasing the operating expenses.

    Q

    Why is the price quotation so slow?

    A

    Because centrifugal pumps are non-standard custom products with many models and a wide price range. Even for the same model, the price varies greatly depending on the materials and configurations used. Taking the most common pump accessory—the impeller—as an example, the price of a stainless steel impeller is several times that of a cast iron impeller. Therefore, we need to clearly confirm the relevant information to provide you with an accurate price. Normally, if you provide comprehensive information, we can quote within 5 minutes.

    Q

    What information should I provide when I need a quote?

    A

    Usually, if you want to get an accurate quote, it is recommended that you provide us with the following information: pump flow rate, head, on-site operating voltage, frequency, temperature of the conveyed liquid, pH value, solid particle content, on-site installation conditions (horizontal or vertical installation), and other related details. If you are not very familiar with these, it’s okay; our sales manager will assist you in determining them.

    Q

    Do you have centrifugal pumps in stock?

    A

    There are many models and configurations of centrifugal pumps. Except for a small number of commonly used standard models that are in stock, the vast majority of models and configurations are not stocked and are customized products. We need to first select the pump based on your site conditions such as flow rate, head, medium temperature, pH value, and installation conditions. After determining the pump model and configuration, we can then place an order with the workshop for production.

    Q

    What is your usual delivery time?

    A

    Models in stock can be shipped by the next day at the latest. Others are custom-made, and depending on the product size and specific project conditions, the delivery time is generally between 7-90 days. Please consult our sales manager for details: 0731-88632200 。

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